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90d37239 PB |
1 | /* |
2 | * QEMU Synchronous Serial Interface support | |
3 | * | |
4 | * Copyright (c) 2009 CodeSourcery. | |
b4a76e84 PC |
5 | * Copyright (c) 2012 Peter A.G. Crosthwaite (peter.crosthwaite@petalogix.com) |
6 | * Copyright (c) 2012 PetaLogix Pty Ltd. | |
90d37239 PB |
7 | * Written by Paul Brook |
8 | * | |
8e31bf38 | 9 | * This code is licensed under the GNU GPL v2. |
6b620ca3 PB |
10 | * |
11 | * Contributions after 2012-01-13 are licensed under the terms of the | |
12 | * GNU GPL, version 2 or (at your option) any later version. | |
90d37239 PB |
13 | */ |
14 | ||
0430891c | 15 | #include "qemu/osdep.h" |
8fd06719 | 16 | #include "hw/ssi/ssi.h" |
d6454270 | 17 | #include "migration/vmstate.h" |
0b8fa32f | 18 | #include "qemu/module.h" |
7e272a00 | 19 | #include "qapi/error.h" |
90d37239 PB |
20 | |
21 | struct SSIBus { | |
d43269dd | 22 | BusState parent_obj; |
90d37239 PB |
23 | }; |
24 | ||
0d936928 AL |
25 | #define TYPE_SSI_BUS "SSI" |
26 | #define SSI_BUS(obj) OBJECT_CHECK(SSIBus, (obj), TYPE_SSI_BUS) | |
27 | ||
28 | static const TypeInfo ssi_bus_info = { | |
29 | .name = TYPE_SSI_BUS, | |
30 | .parent = TYPE_BUS, | |
31 | .instance_size = sizeof(SSIBus), | |
10c4c98a GH |
32 | }; |
33 | ||
66530953 PC |
34 | static void ssi_cs_default(void *opaque, int n, int level) |
35 | { | |
36 | SSISlave *s = SSI_SLAVE(opaque); | |
37 | bool cs = !!level; | |
38 | assert(n == 0); | |
39 | if (s->cs != cs) { | |
40 | SSISlaveClass *ssc = SSI_SLAVE_GET_CLASS(s); | |
41 | if (ssc->set_cs) { | |
42 | ssc->set_cs(s, cs); | |
43 | } | |
44 | } | |
45 | s->cs = cs; | |
46 | } | |
47 | ||
48 | static uint32_t ssi_transfer_raw_default(SSISlave *dev, uint32_t val) | |
49 | { | |
50 | SSISlaveClass *ssc = SSI_SLAVE_GET_CLASS(dev); | |
51 | ||
52 | if ((dev->cs && ssc->cs_polarity == SSI_CS_HIGH) || | |
53 | (!dev->cs && ssc->cs_polarity == SSI_CS_LOW) || | |
54 | ssc->cs_polarity == SSI_CS_NONE) { | |
55 | return ssc->transfer(dev, val); | |
56 | } | |
57 | return 0; | |
58 | } | |
59 | ||
7673bb4c | 60 | static void ssi_slave_realize(DeviceState *dev, Error **errp) |
90d37239 | 61 | { |
cd6c4cf2 AL |
62 | SSISlave *s = SSI_SLAVE(dev); |
63 | SSISlaveClass *ssc = SSI_SLAVE_GET_CLASS(s); | |
90d37239 | 64 | |
66530953 PC |
65 | if (ssc->transfer_raw == ssi_transfer_raw_default && |
66 | ssc->cs_polarity != SSI_CS_NONE) { | |
de77914e | 67 | qdev_init_gpio_in_named(dev, ssi_cs_default, SSI_GPIO_CS, 1); |
66530953 PC |
68 | } |
69 | ||
7673bb4c | 70 | ssc->realize(s, errp); |
90d37239 PB |
71 | } |
72 | ||
39bffca2 | 73 | static void ssi_slave_class_init(ObjectClass *klass, void *data) |
90d37239 | 74 | { |
66530953 | 75 | SSISlaveClass *ssc = SSI_SLAVE_CLASS(klass); |
39bffca2 | 76 | DeviceClass *dc = DEVICE_CLASS(klass); |
66530953 | 77 | |
7673bb4c | 78 | dc->realize = ssi_slave_realize; |
0d936928 | 79 | dc->bus_type = TYPE_SSI_BUS; |
66530953 PC |
80 | if (!ssc->transfer_raw) { |
81 | ssc->transfer_raw = ssi_transfer_raw_default; | |
82 | } | |
90d37239 PB |
83 | } |
84 | ||
8c43a6f0 | 85 | static const TypeInfo ssi_slave_info = { |
39bffca2 AL |
86 | .name = TYPE_SSI_SLAVE, |
87 | .parent = TYPE_DEVICE, | |
88 | .class_init = ssi_slave_class_init, | |
89 | .class_size = sizeof(SSISlaveClass), | |
90 | .abstract = true, | |
91 | }; | |
92 | ||
90d37239 PB |
93 | DeviceState *ssi_create_slave(SSIBus *bus, const char *name) |
94 | { | |
7e272a00 | 95 | DeviceState *dev = qdev_new(name); |
74687e40 | 96 | |
7e272a00 | 97 | qdev_realize_and_unref(dev, &bus->parent_obj, &error_fatal); |
90d37239 PB |
98 | return dev; |
99 | } | |
100 | ||
02e2da45 | 101 | SSIBus *ssi_create_bus(DeviceState *parent, const char *name) |
90d37239 | 102 | { |
02e2da45 | 103 | BusState *bus; |
0d936928 | 104 | bus = qbus_create(TYPE_SSI_BUS, parent, name); |
fef7fbc9 | 105 | return SSI_BUS(bus); |
90d37239 PB |
106 | } |
107 | ||
108 | uint32_t ssi_transfer(SSIBus *bus, uint32_t val) | |
109 | { | |
d43269dd | 110 | BusState *b = BUS(bus); |
0866aca1 | 111 | BusChild *kid; |
cd6c4cf2 | 112 | SSISlaveClass *ssc; |
b4a76e84 | 113 | uint32_t r = 0; |
0866aca1 | 114 | |
d43269dd | 115 | QTAILQ_FOREACH(kid, &b->children, sibling) { |
b4a76e84 PC |
116 | SSISlave *slave = SSI_SLAVE(kid->child); |
117 | ssc = SSI_SLAVE_GET_CLASS(slave); | |
66530953 | 118 | r |= ssc->transfer_raw(slave, val); |
90d37239 | 119 | } |
b4a76e84 PC |
120 | |
121 | return r; | |
90d37239 | 122 | } |
39bffca2 | 123 | |
66530953 PC |
124 | const VMStateDescription vmstate_ssi_slave = { |
125 | .name = "SSISlave", | |
126 | .version_id = 1, | |
127 | .minimum_version_id = 1, | |
8f1e884b | 128 | .fields = (VMStateField[]) { |
66530953 PC |
129 | VMSTATE_BOOL(cs, SSISlave), |
130 | VMSTATE_END_OF_LIST() | |
131 | } | |
132 | }; | |
133 | ||
83f7d43a | 134 | static void ssi_slave_register_types(void) |
39bffca2 | 135 | { |
0d936928 | 136 | type_register_static(&ssi_bus_info); |
39bffca2 AL |
137 | type_register_static(&ssi_slave_info); |
138 | } | |
139 | ||
83f7d43a | 140 | type_init(ssi_slave_register_types) |